66565101 has 8 divisors (see below), whose sum is σ = 89568160. Its totient is φ = 43969392.

The previous prime is 66565097. The next prime is 66565111. The reversal of 66565101 is 10156566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66565101 - 2² = 66565097 is a prime.

It is a super-2 number, since 2×66565101² = 8861825342280402, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66565111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101455 + ... + 102108.

It is an arithmetic number, because the mean of its divisors is an integer number (11196020).

Almost surely, 2^66565101 is an apocalyptic number.

It is an amenable number.

66565101 is a deficient number, since it is larger than the sum of its proper divisors (23003059).

66565101 is a wasteful number, since it uses less digits than its factorization.

66565101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203675.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 66565101 is about 8158.7438371357. The cubic root of 66565101 is about 405.2741140804.

It can be divided in two parts, 66565 and 101, that added together give a palindrome (66666).

The spelling of 66565101 in words is "sixty-six million, five hundred sixty-five thousand, one hundred one".